Felo

Abbreviation Expander and Shortener Online

Expand texting acronyms and technical abbreviations into full forms, or shorten full phrases back into abbreviations, using a complete 40-pair table applied in both directions. Every unlisted word is preserved exactly, and each result comes with a short report of what was replaced. Try it online.

What is Abbreviation Expander and Shortener Online?

Abbreviation Expander and Shortener Online is a conversational tool that converts between a fixed set of common abbreviations and their full forms. Give it text full of texting acronyms such as "tysm" or "brb" and it returns the expanded English. Give it full phrases such as "of course" or "as soon as possible" and it returns the short forms. The conversion uses a complete 40-pair table that is stated explicitly, so the same input always produces the same output.

Key Features

Two directions in one tool. Expand abbreviations into full forms, or shorten full forms into abbreviations, depending on which way you ask.
Complete, explicit mapping. All 40 pairs are defined, including texting acronyms, honorifics, and technical acronyms such as LASER, SCUBA, RADAR and DNA.
Exact preservation. Words that are not in the table come back unchanged, with original spacing and punctuation kept.
Match report. Each result lists which entries were replaced and which tokens were left alone, so you can see why the output looks the way it does.
Custom pairs per request. Add a temporary pair such as "gm = good morning" for one message without waiting for anyone to update a list.

How to Use

Paste your text and say which direction you want, for example "expand: idk brb tysm" or "shorten: I don't know, be right back". If you do not state a direction, the tool infers it from whether the text contains listed abbreviations or listed full forms.
Read the converted text in the copyable block, then check the short match report underneath to confirm which entries were replaced.
Ask for a refinement if needed, such as adding a custom pair, switching direction, or keeping a specific term untouched.

Example Use Cases

Decoding a text message. Paste "ngl idk tbh" and get "not gonna lie I don't know to be honest" with each replacement listed.
Shortening a note for a group chat. Paste "as soon as possible, bring your own bottle, let me know" and get the matching abbreviations.
Checking technical acronym expansions. Paste "laser scuba radar dna" and get the full technical names, useful when writing a glossary.

Tips for Best Results

State the direction explicitly when your text could plausibly be read either way, for example a single word like "thanks".
Keep punctuation as you want it in the output; the tool preserves it rather than normalizing it.
If a term you need is not in the table, add it as a custom pair in the same message.

FAQ

What input format does it accept?
Plain text of any reasonable length. Very long passages are processed in full, but the match report is summarized when there are many replacements.

How accurate is the result?
The conversion is deterministic: listed entries are replaced exactly as defined in the table, and everything else is preserved. Accuracy therefore depends on whether your term is in the table; unlisted terms are never guessed.

How is this different from some free text tools?
Some free text tools use a small fixed list and do not explain which entries matched or how unlisted words are handled. This tool states the full table, preserves unmatched text, and reports each replacement. It does not add a larger dictionary than the 40 pairs listed, and it does not produce fonts, images or audio.

Can I add my own abbreviations?
Yes, for the current conversation. Custom pairs apply to your request and are not saved permanently.